If you have everything going through the desk, you can just record the line-out. If not, you'd have to use a stereo pair of mics, which will not necessarily give a great result, but may be good enough for what you're looking for. Which method will you go for? And what do you want to do with it after? IE just a bit of comp and EQ, or a full edit and mix? Then we'd have a better idea of what to recommend.
Also, I think you're looking for a quick, easy, effective, cheap recording solution, rather than an "epic" one, which would probably prove rather inconvinient.